SU1430879A1 - Ultrasonic device for material quality control - Google Patents

Abstract

This invention relates to the field of non-destructive testing of materials using ultrasound. The aim of the invention is to increase the monitoring performance by measuring the time of arrival of the echo signal during one sensing cycle. The amplitude of the received echo amplifier 4 is stored by one of the peak detectors 6 (or 17) and is compared with the amplitude of the previous echo signal. The time meter 8 is triggered by the pulses of synchronizer 1, and is stopped by the pulses of the comparator 7, generated at the moment of equality of the amplitude of the echo signal and the memorized value of the amplitude of the echo signal of the previous sounding cycle. 1 il. (Oh (L

Description

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This invention relates to the non-destructive testing of materials using ultrasound.

The aim of the invention is to increase the monitoring performance by measuring the time of arrival of the echo signal during one sounding cycle.

The drawing shows a block diagram of the device.

The device contains serially connected synchronizer 1, generator 2 probe pulses, transceiver converter 3, amplifier 4, first analog key 5, peak detector 6, comparator 7, meter 8 time intervals, driver 9 gating pulses, delay element 10 switched between the synchronizer 1 and shaper pulse shaper 9, trigger 11, counting input connected to synchronizer 1 output, first and second elements 12, 13, the first inputs of which are combined and connected to direct output three the gage 11, the second input of the first element And 12 is connected: to the output of the imaging unit 9 gating pulses, the output of the first element And 12 is connected to the second input of the first analog switch 5, the second input of the second element And 13 is connected to the output of the synchronizer 1, the third and fourth elements And 14 , 15, the first inputs of which are combined and connected to the inverse output of the trigger 11, the second input of the third element 14 is connected to the output of the gate generator 9, the second input of the fourth element 15 is connected to the output of the synchronizer 1, sequentially the second analog switch 16 and the peak detector 17 connected, the first input of the second analog switch 16 is connected to the output of the amplifier 4, the second input of the second analog switch 16 is connected to the output of the third circuit And 14, the output of the second peak detector 17 is connected to the second input of the comparator 7, the second input the first peak detector 6 is connected to the output of the fourth circuit And 15, the second input of the second peak detector 17 is connected to the output of the second circuit And 13, and the second input of the meter 8 time intervals connected to the output of the synchronizer 1.

The device works as follows.

The synchronizer 1 starts the generator 2 probe pulses, providing excitation of ultrasonic vibrations in the converter 3. The pulses of ultrasonic oscillations passed through the controlled product are perceived by the transceiver 3 and are fed to the input of the amplifier 4 from its output.

At the same time, synchronizer 1 turns on delay element 10, which defines the leading edge of the strobe,

sets the meter 8 time intervals to the Start position and switches the counting trigger 11.

The shaper 9 of gating pulses, which determines the level of the gating pulse and its duration, provides a signal to the input elements And 12, 14.

The signal from the single output of trigger 11 opens the elements And 12, 13.

An analog switch 5 opens, and an echo from amplifier 4 is fed to peak detector 6.

At the same time, the peak detector 17 comes from the element And 13 pulse Reset, and comes later than the echo signal. Therefore, two voltages are simultaneously present at the inputs of the comparator 7, one of which is the result of the charge of the peak detector 17 in the previous period, and the other is the result of the charge of the pico-iBoro detector 6 in the given period

Due to the fact that the peak detectors 17 and 6 are completely identical and are equipped, in addition to the charging circuits, also with slow discharge circuits, at each time point the voltage at their outputs is different. At the same time, the voltage on the code of the peak detector, which is charged earlier, is always less than the voltage at the output of the peak detector, which is charged later.

Due to these conditions, the voltage on one of the two inputs of the comparator 7 always exceeds the voltage on the other input. At the moment of a jump occurring near

transitioning an echo through a maximum, a pulse is generated at the output of the comparator 7, which is used as a Stop signal and transmitted to the input. , meter 8 time intervals.

Claims (1)

The invention makes it possible to measure the time interval determined by the coordinate of the defect in one probing cycle, which leads to an increase in the productivity of the control. Invention Formula An ultrasonic device for quality control of materials containing a synchronously connected synchronizer, a probe pulse generator, a transceiver transducer, an amplifier, a first analog switch, a first peak detector, a comparator, a time interval meter, and a gating pulse shaper, so that control performance, it is equipped with a delay element connected between the synchronizer and the gate driver, trigger, counting input connected to the output of the synchronizer, said first and second AND elements, first inputs of which are combined and connected to the direct output of the flip-flop, a second input pervo0 The first element And is connected to the output of the gating device impuls, the code of the first element And is connected to the second input of the first anap key, the second input of the second element And is connected to the synchronizer output, the third T is the fourth element And, the first inputs of which are combined and connected to the inverse trigger output, the second the input of the third element And is connected to the output of the gating pulse shaper, the second input of the fourth element And is connected to the output of the synchronizer connected in series by the second analog key and a peak detector, the first input of the second analog switch is connected to the amplifier amplifier, the second input of the second analog switch is connected to the output of the third element, And the output of the second peak detector is connected to the second input of the comparator, the second input of the first peak detector is connected to the output of the second element And, and the input of the time interval meter is connected to the synchronizer code. five 0